1893 25C Isabella Quarter PR64 NGC. Only 103 proof Isabella
quarters were struck. These special strikings consisted of the
first hundred strikes from the die, and were eventually followed by
the 400th, 1492nd, and 1892nd coins struck. There are no published
or known diagnostics for proofs, they simply "carry their own
credentials" as Walter Breen used to say. The fields on this piece
are very deeply mirrored, much more so than on one of the many
prooflike examples that are known of this issue. Fully struck in
all areas with just the slightest flaws that prevent a full Gem
grade. Population: 16 in 64, 6 finer (4/03). (PCGS# 9221)